At about 9:50 a.m., nine people in Robin Hood costumes allegedly chained themselves to a lamppost, forming a human chain that blocked traffic in the crosswalk opposite the New York Stock Exchange at Wall and Broad streets.

Emergency Service Unit cops used bolt cutters to snip the locks, and herded the demonstrators into police vans, officers said.

About an hour later, 10 activists were rounded up during a rally at Broadway and Park Place near City Hall Park, police added.

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Three students were sprayed with a caustic substance yesterday in an elevator at a Chelsea high school, education officials said.

Two young women and a male student suffered eye irritation and had difficulty breathing after the toxic chemical was unleashed at 1:45 p.m. in Fashion Industries HS on West 24th Street near Seventh Avenue, the officials added.

Staten Island

A boozy motorist was caught hightailing it through West Brighton with a 22-ounce bottle of Coors Light in her lap, authorities said.

Orressa Carruthers, 44, was recklessly driving a Dodge Charger on Broadway at around 2:20 a.m. Sunday and pulled up on the sidewalk when police pulled her over, cops said.

Carruthers, who was allegedly babbling incoherently and cursing at the officers, was cuffed for DWI after cops spotted the open alcoholic beverage and she refused to take a Breathalyzer test, court papers state.

Queens

The gunman is wanted for pulling off three holdups in Sunnyside, police said.

He first struck on April 12 on 46th Street, forcing a 25-year-old man to withdraw money from an ATM and hand it over.

He hit again on April 18, flashing a firearm at a guy walking down 44th Street and swiping an ATM card.

He resurfaced Monday, targeting a 25-year-old man at 44th Street and 50th Avenue at 7:35 p.m.

The bandit snatched the victim’s iPhone and forced him to withdraw cash from two ATMs and hand it over.

The Bronx

Two hoods pulled off a terrifying home invasion in the South Bronx, cops said.

The suspect pictured and a cohort pushed a 46-year-old man into his Eagle Avenue apartment at around 8:10 p.m. on April 13.

They bound the victim’s hands with cable, took cash and electronics from his home and fled in a white van.

***

A teen shot a young man outside a Fordham bodega last night, police sources said.

The 22-year-old victim was at the bodega on Webster Avenue near East 188th Street at around 10:35 p.m. when he was shot by the 18-year-old gunman, cops said.

The victim, whose name was not released, fell to his knees as the thug unloaded another round and fled.

Police found the suspect nearby hiding under a van. The victim died at St. Barnabas Medical Center.

Charges were pending early today.

Brooklyn

This was a Mac attack of the criminal kind.

Two thugs robbed a man in Prospect Park South and used his credit card at a McDonald’s, cops said.

The suspect pictured and a cohort ambushed the 34-year-old victim at Albemarle and Rugby roads at around 4 p.m. Saturday.

“Don’t look up and you won’t get hurt,” one thug snarled as he snatched the victim’s cellphone and wallet.

Later, surveillance video from a nearby McDonald’s on Flatbush Avenue recorded the thieves smiling and sipping sodas after buying food with the victim’s credit card.

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A 34-year-old man was shot dead yesterday in the lobby of a Weeksville building, police said.

The victim was shot twice in the head just before 1 p.m. in the foyer of 320 Empire Boulevard, police added.

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An elderly woman was fatally struck by a car yesterday in Sheepshead Bay, police said.

The 75-year-old woman was hit by a vehicle driven by a 36-year-old motorist as the victim was crossing Avenue S near East 15th Street at 12:40 p.m. Cops said no criminality is suspected.